Adsorption of Anionic Dyes onto Chitosan-modified Diatomite |
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| Authors: | ZHANG Ge-shan XUE Hong-hai TANG Xiao-jian PENG Fei and KANG Chun-li |
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| Institution: | 1. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, P. R. China;
2. School of Municipal and Environmental Engineering, Jilin Institute of Architecture and Civil Engineering, Changchun 130118, P. R. China |
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| Abstract: | The purpose of this work is to study the possibility of anionic dyes Reactive Red M-8B(RR) and Direct Green B(DG) adsorbed on chitosan-modified diatomite. The characteristics of adsorbent, adsorption isotherms and the influence of adsorption time, temperature and pH were researched in this work. The results show that the mo- dified diatomite had a much better adsorption capability than the natural diatomite. The adsorption capacities of chitosan-modified diatomite for RR and DG were 94.46 and 137.0 mg/g, respectively. Both adsorption time and adsorption temperature provided a positive effect on the dye adsorption. Within the experimental pH range, the adsorbance was enhanced at lower pH but reduced sharply at high pH. On the basis of the experimental results and discussion, electrostatic attraction is considered as the main mechanism of this chemisorption. |
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| Keywords: | Diatomite Chitosan-modified diatomite Adsorption Reactive Red M-8B Direct Green B |
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